ttcn3
/
osmo-ttcn3-hacks
mirror of https://gerrit.osmocom.org/osmo-ttcn3-hacks
10
0
Fork 1
Code Issues Releases Wiki Activity

mme: Trigger last parts of procedure TC_ue_cell_reselect_eutran_to_geran 

Some later parts of the 4G->2G cell reselection where missing, mostly
related to tear down after MS has successfuly moved to the new SGSN. mainly:
- S6a Diameter Cancel Location Req + Answer initiated by HSS.
- Handle UeReleaseContextCommand and answer with
  UeReleaseContextComplete, emulating the ENB.
- handle S11 GTPv2C Delete Session Request and answer with Delete
  Session Response, emulating the SGW.

Change-Id: Ic0263a3aec922194aad22b031b2c82a99954354d
This commit is contained in:
Pau Espin 2023-12-21 19:23:48 +01:00
parent 278f543102
commit 35c0cc2d2a
1 changed files with 118 additions and 34 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

152
mme/MME_Tests.ttcn
View File

@ -178,6 +178,9 @@ modulepar {
/* S6 interface */
charstring mp_s6_local_ip := "127.0.0.4";
integer mp_s6_local_port := 3868;
charstring mp_s6_diam_realm := "localdomain";
charstring mp_s6_local_diam_host := "hss.localdomain";
charstring mp_s6_remote_diam_host := "mme.localdomain";
/* SGs interface */
charstring mp_sgs_local_ip := "127.0.0.1";
@ -643,6 +646,30 @@ private altstep as_s1ap_handle_IntialCtxSetupReq() runs on ConnHdlr {
}
}
private altstep as_s1ap_handle_UeContextReleaseCmd(template S1AP_IEs.Cause cause := ?) runs on ConnHdlr {
var S1AP_PDU rx_msg;
var PDU_NAS_EPS rx_nas;
[] S1AP.receive(tr_S1AP_UeContextReleaseCmd(?, cause)) -> value rx_msg {
var template MME_UE_S1AP_ID mme_ue_id;
var template ENB_UE_S1AP_ID enb_ue_id;
if (not ispresent(rx_msg.initiatingMessage.value_.uEContextReleaseCommand.protocolIEs[0].value_.uE_S1AP_IDs.uE_S1AP_ID_pair)) {
/* TODO: The UE CONTEXT RELEASE COMMAND (see also: 3GPP TS 36.413, section 9.1.4.6), may identify the
* context by either an uE_S1AP_ID_pair (MME_UE_S1AP_ID and ENB_UE_S1AP_ID) or an MME_UE_S1AP_ID alone.
* The latter case is not implemented here yet. */
Misc_Helpers.f_shutdown(__BFILE__, __LINE__, fail, log2str("complete implementation of UeContextReleaseCmd handling"));
return;
}
mme_ue_id := rx_msg.initiatingMessage.value_.uEContextReleaseCommand.protocolIEs[0].value_.uE_S1AP_IDs.uE_S1AP_ID_pair.mME_UE_S1AP_ID;
enb_ue_id := rx_msg.initiatingMessage.value_.uEContextReleaseCommand.protocolIEs[0].value_.uE_S1AP_IDs.uE_S1AP_ID_pair.eNB_UE_S1AP_ID;
S1AP.send(ts_S1AP_UeContextReleaseCompl(mme_ue_id, enb_ue_id));
}
[] S1AP.receive(PDU_NAS_EPS:?) -> value rx_nas {
Misc_Helpers.f_shutdown(__BFILE__, __LINE__, fail, log2str("Rx Unexpected NAS PDU msg: ", rx_nas));
}
}
/* Exepect AuthInfoReq (AIR) from HSS; respond with AuthInforAnswer (AIA) */
private altstep as_DIA_AuthInfo() runs on ConnHdlr {
var PDU_DIAMETER rx_dia;
@ -698,6 +725,33 @@ private altstep as_DIA_UpdLoc() runs on ConnHdlr {
}
}
private function f_DIA_CancelLocation(integer idx := 0, template S1AP_IEs.Cause cause := omit) runs on ConnHdlr {
var UINT32 hbh_id := f_rnd_octstring(4);
var UINT32 ete_id := f_rnd_octstring(4);
var PDU_DIAMETER rx_dia;
/* Unlike CLR, CLA contains no IMSI. Register ete_id in DIAMETER_Emulation,
* so AIA is forwarded back to us in DIAMETER port instead of MTC_CT.DIAMETER_UNIT.
*/
f_diameter_expect_eteid(ete_id);
DIAMETER.send(ts_DIA_CLR(g_pars.ue_pars.imsi, SGSN_UPDATE_PROCEDURE,
orig_host := mp_s6_local_diam_host,
orig_realm := mp_s6_diam_realm,
dest_host := mp_s6_remote_diam_host,
dest_realm := mp_s6_diam_realm,
hbh_id := hbh_id,
ete_id := ete_id));
alt {
[] DIAMETER.receive(tr_DIA_CLA) -> value rx_dia {}
[] DIAMETER.receive(PDU_DIAMETER:?) -> value rx_dia {
Misc_Helpers.f_shutdown(__BFILE__, __LINE__, fail, log2str("Unexpected Diameter S6b msg rx: ", rx_dia));
}
}
}
private altstep as_GTP2C_CreateSession_success() runs on ConnHdlr {
var PDU_GTPCv2 rx_msg;
var BearerContextIEs rx_bctx_ies;
@ -781,6 +835,57 @@ private altstep as_GTP2C_ModifyBearer_success() runs on ConnHdlr {
}
}
private altstep as_GTP2C_DeleteSession_success() runs on ConnHdlr {
var PDU_GTPCv2 rx_msg;
[] GTP2.receive(tr_GTP2C_DeleteSessionReq(g_pars.ue_pars.s11_teic_local)) -> value rx_msg {
GTP2.send(ts_GTP2C_DeleteSessionResp(g_pars.ue_pars.s11_teic_remote,
rx_msg.sequenceNumber,
Request_accepted));
setverdict(pass);
}
[] GTP2.receive {
Misc_Helpers.f_shutdown(__BFILE__, __LINE__, fail,
log2str("Unexpected GTPv2/S11 message from MME"));
}
}
private function f_gtp_sgsn_context_4g_to_2g(OCT4 new_sgsn_local_teid := '12345678'O) runs on ConnHdlr {
var template (value) GTPC_PDUs SGSNContextReqPDU;
var RoutingAreaIdentity rai;
var OCT4 ptmsi;
var OCT3 ptmsi_sig;
var Gtp1cUnitdata gtpc_pdu;
var OCT4 old_mme_local_teid;
guti2rai_ptmsi(g_pars.ue_pars.guti, rai, ptmsi, ptmsi_sig);
SGSNContextReqPDU := ts_SGSNContextReqPDU(rai, new_sgsn_local_teid, f_inet_addr(mp_gn_local_ip),
ptmsi := ts_PTMSI(ptmsi), ptmsi_sig := ts_PTMSI_sig(ptmsi_sig));
GTP.send(ts_GTPC_SGSNContextReq(g_gn_iface_peer, 0, SGSNContextReqPDU));
timer T := 5.0;
T.start;
alt {
[] GTP.receive(tr_GTPC_SGSNContextResp(g_gn_iface_peer, new_sgsn_local_teid,
tr_SGSNContextRespPDU(GTP_CAUSE_REQUEST_ACCEPTED,
g_pars.ue_pars.imsi))) -> value gtpc_pdu {
old_mme_local_teid := gtpc_pdu.gtpc.gtpc_pdu.sgsn_ContextResponse.teidControlPlane.teidControlPlane;
setverdict(pass);
}
[] GTP.receive {
setverdict(fail, "unexpected GTPC message from MME");
}
[] T.timeout {
setverdict(fail, "no SGSN Context Response from MME");
}
}
GTP.send(ts_GTPC_SGSNContextAck(g_gn_iface_peer, old_mme_local_teid,
oct2int(gtpc_pdu.gtpc.opt_part.sequenceNumber),
ts_SGSNContextAckPDU(GTP_CAUSE_REQUEST_ACCEPTED)));
}
private function f_attach() runs on ConnHdlr {
var template (value) EPS_MobileIdentityV mi := ts_NAS_MobileId_IMSI(g_pars.ue_pars.imsi);
@ -1231,47 +1336,26 @@ private function guti2rai_ptmsi(in NAS_EPS_Types.GUTI guti, out RoutingAreaIdent
/* TODO: mMEC "also copied into the 8 Most Significant Bits of the NRI field within the P-TMSI" */
}
private function f_TC_ue_cell_reselect_eutran_to_geran(ConnHdlrPars pars) runs on ConnHdlr {
var template (value) GTPC_PDUs SGSNContextReqPDU;
var RoutingAreaIdentity rai;
var OCT4 ptmsi;
var OCT3 ptmsi_sig;
var Gtp1cUnitdata gtpc_pdu;
var OCT4 new_sgsn_local_teid := '12345678'O;
var OCT4 old_mme_local_teid;
f_init_handler(pars);
f_gtp_register_imsi(g_pars.ue_pars.imsi);
f_attach();
/* TODO: take GUTI from as_s1ap_handle_IntialCtxSetupReq() in g_pars,
* convert it to P-TMSI and pass P-TMSI below */
guti2rai_ptmsi(g_pars.ue_pars.guti, rai, ptmsi, ptmsi_sig);
/* TS 23.401 Figure D.3.5-1 Steps 1,2,3,4: */
f_gtp_sgsn_context_4g_to_2g();
SGSNContextReqPDU := ts_SGSNContextReqPDU(rai, new_sgsn_local_teid, f_inet_addr(mp_gn_local_ip),
ptmsi := ts_PTMSI(ptmsi), ptmsi_sig := ts_PTMSI_sig(ptmsi_sig));
GTP.send(ts_GTPC_SGSNContextReq(g_gn_iface_peer, 0, SGSNContextReqPDU));
/* TS 23.401 Figure D.3.5-1 Step 8: */
f_DIA_CancelLocation();
timer T := 5.0;
T.start;
alt {
[] GTP.receive(tr_GTPC_SGSNContextResp(g_gn_iface_peer, new_sgsn_local_teid,
tr_SGSNContextRespPDU(GTP_CAUSE_REQUEST_ACCEPTED,
g_pars.ue_pars.imsi))) -> value gtpc_pdu {
old_mme_local_teid := gtpc_pdu.gtpc.gtpc_pdu.sgsn_ContextResponse.teidControlPlane.teidControlPlane;
setverdict(pass);
}
[] GTP.receive {
setverdict(fail, "unexpected GTPC message from MME");
}
[] T.timeout {
setverdict(fail, "no SGSN Context Response from MME");
}
}
/* TS 23.401 Figure D.3.5-1 Step 13:
* Upon rx of SGSN Context Acknowledge, MME released the ENB/UE context:
*/
as_s1ap_handle_UeContextReleaseCmd();
GTP.send(ts_GTPC_SGSNContextAck(g_gn_iface_peer, old_mme_local_teid,
oct2int(gtpc_pdu.gtpc.opt_part.sequenceNumber),
ts_SGSNContextAckPDU(GTP_CAUSE_REQUEST_ACCEPTED)));
/* Give some time to process the SGSNContextACK: */
/* TS 23.401 Figure D.3.5-1 Step 13:
* After Gn timer triggers, the SGW session is deleted:
*/
as_GTP2C_DeleteSession_success();
/* Let MME some time to handle the Create Session Response: */
f_sleep(3.0);
}
testcase TC_ue_cell_reselect_eutran_to_geran() runs on MTC_CT {